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  <h2>python/MySQL入门/10-MySQL记录操作</h2>



  <p class="post-date">2020-10-22</p>
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    <section class="markdown-content"><h1 id="一、概览"><a href="#一、概览" class="headerlink" title="一、概览"></a>一、概览</h1><p>MySQL数据操作： DML</p>
<p>在MySQL管理软件中，可以通过SQL语句中的DML语言来实现数据的操作，包括：</p>
<ol>
<li>使用INSERT实现数据的插入</li>
<li>UPDATE实现数据的更新</li>
<li>使用DELETE实现数据的删除</li>
<li>使用SELECT查询数据以及。</li>
</ol>
<h1 id="二、插入数据（insert）"><a href="#二、插入数据（insert）" class="headerlink" title="二、插入数据（insert）"></a>二、插入数据（insert）</h1><figure class="highlight sql"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br></pre></td><td class="code"><pre><span class="line">Copy1. 插入完整数据（顺序插入）</span><br><span class="line">    语法一：</span><br><span class="line">    <span class="keyword">INSERT</span> <span class="keyword">INTO</span> 表名(字段<span class="number">1</span>,字段<span class="number">2</span>,字段<span class="number">3</span>…字段n) <span class="keyword">VALUES</span>(值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…值n);</span><br><span class="line"></span><br><span class="line">    语法二：</span><br><span class="line">    <span class="keyword">INSERT</span> <span class="keyword">INTO</span> 表名 <span class="keyword">VALUES</span> (值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…值n);</span><br><span class="line"></span><br><span class="line">2. 指定字段插入数据</span><br><span class="line">    语法：</span><br><span class="line">    <span class="keyword">INSERT</span> <span class="keyword">INTO</span> 表名(字段<span class="number">1</span>,字段<span class="number">2</span>,字段<span class="number">3</span>…) <span class="keyword">VALUES</span> (值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…);</span><br><span class="line"></span><br><span class="line">3. 插入多条记录</span><br><span class="line">    语法：</span><br><span class="line">    <span class="keyword">INSERT</span> <span class="keyword">INTO</span> 表名 <span class="keyword">VALUES</span></span><br><span class="line">        (值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…值n),</span><br><span class="line">        (值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…值n),</span><br><span class="line">        (值<span class="number">1</span>,值<span class="number">2</span>,值<span class="number">3</span>…值n);</span><br><span class="line">        </span><br><span class="line">4. 插入查询结果</span><br><span class="line">    语法：</span><br><span class="line">    <span class="keyword">INSERT</span> <span class="keyword">INTO</span> 表名(字段<span class="number">1</span>,字段<span class="number">2</span>,字段<span class="number">3</span>…字段n) </span><br><span class="line">                    <span class="keyword">SELECT</span> (字段<span class="number">1</span>,字段<span class="number">2</span>,字段<span class="number">3</span>…字段n) <span class="keyword">FROM</span> 表<span class="number">2</span></span><br><span class="line">                    <span class="keyword">WHERE</span> …;</span><br></pre></td></tr></table></figure>

<h1 id="三、更新数据（update）"><a href="#三、更新数据（update）" class="headerlink" title="三、更新数据（update）"></a>三、更新数据（update）</h1><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br></pre></td><td class="code"><pre><span class="line">Copy语法：</span><br><span class="line">    UPDATE 表名 SET</span><br><span class="line">        字段<span class="number">1</span>=值<span class="number">1</span>,</span><br><span class="line">        字段<span class="number">2</span>=值<span class="number">2</span>,</span><br><span class="line">        WHERE CONDITION;</span><br><span class="line"></span><br><span class="line">示例：</span><br><span class="line">    UPDATE mysql.user SET password=password(<span class="string">'123'</span>) </span><br><span class="line">        where user=<span class="string">'root'</span> <span class="keyword">and</span> host=<span class="string">'localhost'</span>;</span><br></pre></td></tr></table></figure>

<h1 id="四、删除数据（delete）"><a href="#四、删除数据（delete）" class="headerlink" title="四、删除数据（delete）"></a>四、删除数据（delete）</h1><figure class="highlight python"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br></pre></td><td class="code"><pre><span class="line">Copy语法：</span><br><span class="line">    DELETE FROM 表名 </span><br><span class="line">        WHERE CONITION;</span><br><span class="line"></span><br><span class="line">示例：</span><br><span class="line">    DELETE FROM mysql.user </span><br><span class="line">        WHERE password=<span class="string">''</span>;</span><br></pre></td></tr></table></figure>

<h1 id="五、查询数据（select）"><a href="#五、查询数据（select）" class="headerlink" title="五、查询数据（select）"></a>五、查询数据（select）</h1><h2 id="5-1-单表查询"><a href="#5-1-单表查询" class="headerlink" title="5.1 单表查询"></a>5.1 单表查询</h2><p>单表查询：[MySQL单表查询]</p>
<h2 id="5-2-多表查询"><a href="#5-2-多表查询" class="headerlink" title="5.2 多表查询"></a>5.2 多表查询</h2><p>多表查询：[[MySQL多表查询]</p>
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